import java.util.HashSet;

public class Test {
    public static void main(String[] args) {
        int [] arr=new int[]{2,3,6,7};
        Solution solution=new Solution();
        solution.maxProfit(arr);
        HashSet<Integer>set=new HashSet<>();
        set.add(1);
        solution.longestConsecutive(arr);
        solution.combinationSum(arr,7);
    }
}
